Quorum is a free daily logic puzzle. Every day there is one new board, the same for everyone in the world, and exactly one way to fill it. No guessing: every cell can be deduced from the ones around it.
The rule fits in a sentence: every group of touching equal numbers must be exactly that many cells. Quick boards take about a minute, Hard boards about three, and the clock runs from the moment the board opens.
Play in your browser or install it on your phone, keep a streak, compare your time with everyone who solved today's puzzle, and come back tomorrow for the next one.